12721829 has 4 divisors (see below), whose sum is σ = 13274976. Its totient is φ = 12168684.

The previous prime is 12721801. The next prime is 12721843. The reversal of 12721829 is 92812721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12721829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12721795 and 12721804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276539 + ... + 276584.

It is an arithmetic number, because the mean of its divisors is an integer number (3318744).

Almost surely, 2^12721829 is an apocalyptic number.

It is an amenable number.

12721829 is a deficient number, since it is larger than the sum of its proper divisors (553147).

12721829 is an equidigital number, since it uses as much as digits as its factorization.

12721829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553146.

The product of its digits is 4032, while the sum is 32.

The square root of 12721829 is about 3566.7673038762. The cubic root of 12721829 is about 233.4442518001. Note that the first 3 decimals are identical.

The spelling of 12721829 in words is "twelve million, seven hundred twenty-one thousand, eight hundred twenty-nine".